Mechanical stoker.



0. WUNDHACK.

MECHANICAL STOKER.

APPLICATION man APR. 27, 1912.

19168936?, Patent-ed Jan. 18, 1916.

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MECHANICAL STOKER.

APPLICATION FILED APILzr, I9Iz.

Patented Jan. 18, 1916.

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i1 naar rca OTTO WUNDRACK, MAYWOOD, ILLINO-IS.

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Y .Specification of Letters Patent.

. Patented Jan. i8, i916.

Application led April 27, 1912. Serial No. 693,555.

rlhis invention relates to mechanical' stokers, and has for its objectto provide a newv and improved device of this description.

The invention is illustrated inthe accomp anying drawing whereins Figure1 is` a front view with parts broken away of a furnace supplied with aStoker; Fig. 2 is a sectional-view takenl on line 2-2 of Fig-1; Fig. 3is-an enlarged side view of the upper part of the'front end of theboiler shown in Fig. 1; Fig. 4

is an enlarged sectional view showing the4 grate bars; Fig. 5 isa viewsimilar to Fig. 3 showing a hand operating device.

Like numerals'refer to like parts throughout the several'igures.

As illustrated in the accompanying drawings, the device is applied to anordinary steam boiler furnace for feeding fuel thereto.

rlhe fuel is placed in the receptacle or hopper 1 extending along thefront of the boiler. As shown in Fig. 1` this hopper is provided withinclined bottom pieces 2 and 3, having between them a discharge opening4. Associated with this discharge opening is a feeding wheel 5 providedwith pockets for receiving the fuel-and adapted 'when ro` tated to feedthe fuel regularly and uniformly. Beneath the feeding wheel is aninclined grate made up of a series ofy grate bars 6. These bars arepivotally supported at their upper edges by meansof the pivots 7. Thesebars extend downwardly in an inclined direction as illustrated in Fig. 2to the lower dump grate 8. The grate bars are supported upon the sidesupporting pieces 6a which are carried at theirupper ends by thesupports 6". The side supporting pleces 6a are bent horizontally attheir` lowerends and are supported on the wall 6. These side supportingpieces are provided with slots 7 ainto which the pivots 7 of the barsare received. The dump grate 8 is pivotally supported upon the pivots 9carried by the side supporting pieces 6, and is provided with somesuitable means for dumping it, as for example, the operating pieces 10which extend up to the front of thedoor and are provided with handlepieces 11 and notches 12, said notches adapted to engage the holdingpiece 13 so that the grate mayf be held in any desired position.` Thegrate bars 6 are provided with some suitable means for moving them abouttheir pivotal points. As herein shown, each grate bar is provlded with aprojection 14. rlhese projections are pivotally connected with acontrolling bar 15 which extends along beneath the grate` bars. This barmay be controlled by hand as shown in Fig. 5 by means of reciprocatingpart 16' is connected with-the bar 15 and to an eccentricl on a shaft18. This shaftA 18 passes along the front. of the the pivoted lever 15a.I prefer, however, to

boiler and is provided with a ratchet wheel v 19 (see Figs. 1 and 3)'.VMounted upon the shaft 18 yis an arm 20 carrying an operating pawl 21lwhich engages the teeth of the ratchet wheel 19 when the arm is moved inone direction so as to rotate the shaft 18. This pawl becomes disengagedfrom the teeth when the arm is moved in an opposite direction. The arm20 is connected by a rod 22 with an arm 234 on a shaft 24. The Shaft 24is a rock shaft and is actuated in any desired manner. As shown in Figs.1 and 2, this shaft 24 is rocked by means of an arm 25 fastened theretowhich arm is engaged by a rod 26 connected with an eccentric 27 on arotating shaft 28 which may be rotated in any desired manner as by meansof va motor 29 operatively connected thereto by gears 30. It will beseen that is connected with the shaft 24, said armvbeing connected by arod 32 with an arm 33 mounted on a shaft 34 of the feeding wheel. rlhisarm has a pawl 35 which engages the teeth of a ratchet wheel 36 on theshaft 34. The rods 26, 22and 32 are preferably all made adjustable sothat their lengths may be varied. These rods are preferably ad-Vjustably connected with the arms on the shaft 24 so that the length ofthe stroke may be varied. As herein shown, each ofsaid arms is providedwith a slot 37 (see Figs. 2 and 3)- arranged so that the connectionbetween the rod and the arm may be moved v along said slot to vary thelength lof the arm, and hence the stroke.

Referring now to Fig. 1, it will be noted that the rod 26 is provided atits end with a holethrough which passes a bolt 38' having a head 39, therod 26 being kept in place by the screw, the parts may be moved along`the slot 37 -and held in any desired position by again moving the handle42 to tighten the screw. The eccentrics 17 and 27 are -preferably madeadjustable so that the stroke may be varied. The form of -..theseeccentrics may be seen by referring to eccentric 27 shown in Figs. 1Aand 2. In this.

' construction, the shafts 18 and 28 of the eccentrlcs are mounted in asliding block operation of the device.

'431adapted to be slidvtoward. and from the lcenter ofthe eccentrlc soas to vary the eccentricity of said shaft. This sliding block Aiscontrolledv by a screw 44-which has a screw-threaded engagement with apart 45 fastened to the eccentric, the other end of c attached to thelprojection46 on the. sliding block 43. It'

saidA screw being rotatabl will be seen that by rotating the screw theblock may `be moved in. either direction to varylthe eccentricity andthat this variation may be exceedingly small if desired thus' giving agreat range of "Ii-'egulation in the The rods 16 and 25' are madeadjustable so that they may be easily adjusted when the eccentricity ofthe eccentric is varied. IThe door -47 is located -at'the top, of tle'grate so that the operation.

of the grate maybe seen. This door also gives vaccess to the grate andthe lower end ofl the hopper and the feeding wheel. The

arch 49 may, lof course, be of any desired construction. f y l 'The useand operation of my invention are as follows: Thevdevice may be used inconnection with aseries of furnaces in which event the various shaftswould run the entire length of the series so that-the feeding devicescan all be controlled by a single mctor or driving shaft. The coal orother fuel is placed in the hopperzl and islfed in equal orv measuredquantities by 'means of the feeding wheel 5 tothe grate bars. The coalthen slides along the grate `bars and is burned thereonand on the dumpgrate 8.

The grate bars 6 are gradually rocked about their pivotal points bymeans of the rod 16 and eccentric 17 on the shaft 18. This shaftregulated lindependent of the others.

is slowly and intermittently moved by the pawl 2l and the ratchet 19,said pawl being l above the front part of the bar behind it,

thus forming apocket into which the fuel is received/ As the front -baris moved"A upwardly, the fuel is pushed out of this pocket and passes onto the next grate lbar and'is then moved down to the pocket produced byit, and thus gradually travels `along the grate. It will be seen thatthe speed of movement of the grate bars may be varied at will by'varying the throw of the eccentrics or either -of` them. Theseeccentrics may be regulated so as to vary their throw a very smallamount, as for example, two one-thousandth of an inch, and henceexceedingly close regulation may be sev cured. `It will also be seenthat by regulating the. eccentric 17, each grate may be thisconstruction, very little space is requiredin front of the boilers. A'greater combustion chamber is also secured because of the constructionand the inclined position of the grate. This combustion chamber may bemade five or six feet at the bottom of the grate. The power required-to'operate the apparatus is particularly small and the gradual.'feeding of the coal from pocket to pocket insures -its properconsumption and results .in a great saving of fuel. The device can Vbeeasily and quickly installed or dismantled. In' view of the regulationof the feed, itwill be seen that the device is independent ofthe drivingshaft or motor. By giving the eccentric a long stroke, the coal may befed rapidly and by giving it a short stroke, it may be fed slowly. Theagi'- Atation of the fuel in the hopper due to the feeding wheelprevents it from caking and permits the feeding of just the desiredamount to the grate. This grate is air cooled as .the air passes throughthe grate between the bars and -through the slots in the bars and thereare no clinkers produced.

I claini:

1. A device for feeding fuel to furnaces comprising a grate consisting,of a plurality of members each pivotally mounted contiguous-to one edgeand adapted to provide a continuous inclined fuel supporting surface ora stepped supporting surface, a reciprocable member connected with allof said grate bars for moving the same alternately to said respectivepositions, a crank- Shaft for actuating said member, a ratchet Wheel foractuating said crank-shaft, ahopper for fuel adapted to discharge uponthe upper end of said grate, a rotatable fuel lfeeding device in thedischarge end of said hopper, a shaft therefor carrying a ratchet Wheel,rocking arms equipped with dogs engaging said respective ratchet Wheels,and a Walking beam connected at opposite ends With said rocking arms.

2. A device for feeding fuel to furnaces comprising a grate consistingof a plurality of members each pivotally mounted contiguous to one edgeand adapted to provide a l continuous inclined fuel supporting surfaceor a stepped supporting surface, a reciprocahle member connected withall of said grate bars for moving the same alternately to saidrespectivepositions, a crank-shaft for actuating said reciprocable member, a

ratchet Wheel for actuating said crank-shaft, a hopper for fuel adaptedto discharge upon the upper end of said grate, a rotatable fuel feedingdevice in the discharge end of said hopper, a shaft therefor carrying aratchet Wheel, rocking arms equipped with dogs engaging said respectiveratchet Wheels, a Walking beam having longitudinal slots in its oppositeend portions, and pit- Inen adjustably engaged at one end in saidrespective slots in said Walkingbeam and operatively engaged at theirother ends with y said rocking arms.

Signed atChicago, lilhnois, this 6th day of April 1912.

GTT@ WUNDRACK.

Witnesses:

lWINNrE M. LINDENAU, Danna A. WALTER.

